Replace our home-grown BitCast with bit_cast from Chrome/Google3.

src/compiler/simplified-operator-reducer-unittest.cc

Index: src/compiler/simplified-operator-reducer-unittest.cc
diff --git a/src/compiler/simplified-operator-reducer-unittest.cc b/src/compiler/simplified-operator-reducer-unittest.cc
index 86e72662b5b85937cfa52d219ea978ff8804d403..1736cfcf472d5b8a7098cb995e5e610deb49ce44 100644
--- a/src/compiler/simplified-operator-reducer-unittest.cc
+++ b/src/compiler/simplified-operator-reducer-unittest.cc
@@ -439,7 +439,7 @@ TEST_F(SimplifiedOperatorReducerTest, ChangeTaggedToUint32WithConstant) {
         simplified()->ChangeTaggedToUint32(), NumberConstant(n)));
     ASSERT_TRUE(reduction.Changed());
     EXPECT_THAT(reduction.replacement(),
-                IsInt32Constant(BitCast<int32_t>(DoubleToUint32(n))));
+                IsInt32Constant(bit_cast<int32_t>(DoubleToUint32(n))));
   }
 }
 
@@ -470,7 +470,7 @@ TEST_F(SimplifiedOperatorReducerTest, ChangeUint32ToTagged) {
   TRACED_FOREACH(uint32_t, n, kUint32Values) {
     Reduction reduction =
         Reduce(graph()->NewNode(simplified()->ChangeUint32ToTagged(),
-                                Int32Constant(BitCast<int32_t>(n))));
+                                Int32Constant(bit_cast<int32_t>(n))));
     ASSERT_TRUE(reduction.Changed());
     EXPECT_THAT(reduction.replacement(), IsNumberConstant(FastUI2D(n)));
   }